Periodic Video of Speculum

Prof. Martyn Poliakoff has made a video showing Isaac Newton’s first telescope, which is kept at the Royal Society, in London. As we learned in physics, Isaac Newton used a mirror in his telescope to minimise chromatic aberrations which can occur when using lenses. The mirror was therefore a critical part of the telescope, a special alloy of one-third tin and two-thirds copper and a small amount of arsenic was used, called Speculum.


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